package ithema.Test;
import java.util.Scanner;
public class Test2 {
    public static void main(String[] args) {
        //1.录入字符串
        Scanner sc = new Scanner(System.in);
        String str = sc.next();
        //2.反转字符串
        String result =new StringBuilder().append(str).reverse().toString();
        //3.比较
       if(str.equals(result)){
           System.out.println("yes");
       }else{
           System.out.println("no");
       }
    }
}
